<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
     div{
         width: 400px;
         height: 400px;
         background: url(images/1.jpg) no-repeat , url(images/2.jpg ) no-repeat center,url(images/3.jpg ) no-repeat top right,
         url(images/7.jpg ) no-repeat bottom right,url(images/2.jpg ) no-repeat bottom left;
     }    
    </style>
</head>
<body>
    <div></div>
</body>
</html>